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Use pwgen to generate ramdom passwords pwgen will generate easy to remember passwords # pwgen Vi6yoo9K loisae4A Eeboo9Ci phahc9Ba Eic0teej Mithuij4 ahSah0oh Aiquao7t Xai1mab1 sahx5veZ fai4Osah Hieg0Tai ohz0Ahth wa5ohLai Ol0ielah Phaeshi4 eemeKio8 AeNgei5i thoh...

When we want to connect to a remote host using different credentials and we have automatic login with public key, we have to use some tweaks adding some parameters to scp, like this: -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null Example: scp -o S...

  Show current default target sudo systemctl get-default To start in multi-user mode (text mode) sudo systemctl set-default multi-user.target  To start in graphical mode (X mode) sudo systemctl set-default graphical.target     https://askubuntu.com/questions/8...

Netcat Testing networking services to troubleshoot communications can be easily done with netcat like so: nc -l -p 8000 Source: https://ubidots.com/blog/how-to-simulate-a-tcpudp-client-using-netcat/

Managing services with systemctl Start sudo systemctl start application.service Stop sudo systemctl stop application.service Status sudo systemctl status application.service Enabling service autostart on system boot sudo systemctl enable application.service Di...

Shred shred -zvu -n 3 fileToDelete Wipe wipe -rfi privateDirectory/* SRM (secure remove) srm -vz privateDirectory/*   https://www.tecmint.com/permanently-and-securely-delete-files-directories-linux/

https://serverfault.com/questions/529287/rsync-creates-a-directory-with-the-same-name-inside-of-destination-directory  

Allow All Incoming HTTP   sudo iptables -A INPUT -p tcp --dport 80 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT sudo iptables -A OUTPUT -p tcp --sport 80 -m conntrack --ctstate ESTABLISHED -j ACCEPT   link: https://www.digitalocean.com/community/tutorial...

https://makandracards.com/jan0sch/13431-mounting-iso-images-under-freebsd  

Example using RedHat Linux 6.0 Using lilo bootloader Edit /etc/lilo.conf append="console=tty0 console=ttyS0,9600n8" boot=/dev/hda map=/boot/map install=/boot/boot.b prompt default=linux # Changes for serial console on COM1: in global section # Deleted: messa...

Here is how to join two files side by side in columns, delimited by ";" paste file1 file2 -d ";"  

Creating a ramdisk for fast read/write and comparing it with HDD/SSD drive using dd: # Creating a directory to mount RAM disk mkdir /mnt/ramdisk # mounting ramdisk sudo mount -t tmpfs -o size=1G tmpfs /mnt/ramdisk # Dropping caches before testing for fair di...

Since .bashrc is not working, i managed to do some tricks Edit /etc/profile and add the following lines.......  

Creating an iso file from a directory hdiutil makehybrid -iso -joliet -o output_image.iso input_directory/ Mounting an iso file into /Volumes/ hdiutil mount source_image.iso  

These are the steps to write an raspberry pi OS image to an SD card on MacOS 1. Insert card on reader Identify the disk number diskutil list 2. Unmount the disk unmountDisk /dev/disk2 3. Write the image sudo dd bs=1m if=hassos_rpi3-2.12.img of=/dev/rdisk2 conv...

  dscacheutil -flushcache sudo killall -HUP mDNSResponder https://www.siteground.com/kb/how_to_clear_the_local_dns_cache_in_mac_os/